如图,AB是⊙O的直径,点C在⊙O上,CE^AB于E, CD平分ÐECB, 交过点B的射线于D, 交AB于F, 且BC=BD.
(1)求证:BD是⊙O的切线;
(2)若AE="9," CE="12," 求BF的长.
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如图,AB是⊙O的直径,点C在⊙O上,CE^AB于E, CD平分ÐECB, 交过点B的射线于D, 交AB于F, 且BC=BD.
(1)求证:BD是⊙O的切线;
(2)若AE="9," CE="12," 求BF的长.
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